21969016 has 24 divisors (see below), whose sum is σ = 43479720. Its totient is φ = 10405008.

The previous prime is 21968983. The next prime is 21969023. The reversal of 21969016 is 61096912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 916 + ... + 6691.

It is an arithmetic number, because the mean of its divisors is an integer number (1811655).

Almost surely, 2^21969016 is an apocalyptic number.

It is an amenable number.

21969016 is a deficient number, since it is larger than the sum of its proper divisors (21510704).

21969016 is a wasteful number, since it uses less digits than its factorization.

21969016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651 (or 7628 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 21969016 is about 4687.1116905830. Note that the first 3 decimals coincide. The cubic root of 21969016 is about 280.0723282537.

The spelling of 21969016 in words is "twenty-one million, nine hundred sixty-nine thousand, sixteen".